You know the current through the parallel pair of resistors. How do you get from there to the current through the 20ohm resistor. You don't need voltage.nowayn said:Homework Statement
calculate the electric current in the 20 ohm resistor
The Attempt at a Solution
I have no idea where to start, but i thought maybe you should calculate the voltage first and then the voltage over the 20 ohm resistor.
wait so is the current there also 0,3A?phinds said:
Do you understand the concepts of series elements and parallel elements? If you are not clear on that then you need to GET clear on it before trying ANY problems of this sort, else you will be perpetually confused.nowayn said:
Electric current is the flow of electric charge in a circuit. It is measured in units of amperes (A) and represents the rate at which electric charge passes through a given point in a circuit.
To calculate electric current in a resistor, you can use Ohm's law which states that the current (I) is equal to the voltage (V) divided by the resistance (R). This can be represented by the equation I = V/R.
The electric current in a resistor is affected by the voltage applied, the resistance of the resistor, and the temperature of the resistor. The higher the voltage or the lower the resistance, the higher the current will be. The temperature can also affect the resistance and therefore, the current.
The length and thickness of a resistor can affect the electric current by changing the resistance. A longer resistor will have a higher resistance, resulting in a lower current. A thicker resistor will have a lower resistance, resulting in a higher current.
The relationship between electric current and power in a resistor is given by the equation P = I^2 * R, where P is power, I is current, and R is resistance. This means that as the current increases, the power dissipated by the resistor also increases. Additionally, a higher resistance will result in a higher power dissipation for the same current.